Electronic ballast For N-1 operation, insulate one blue lead to 600 volt rams install and ground per national electrical code rapid start open circuit voltage 775 volt rams voltage to ground High performance electronic ballast for all general fluorescent applicationsInstant start electronic ballast for long lamp starting cycles and low initial costMulti voltage technology handles voltage from 120 to 277 voltLight weight, low profile housingParallel lamp operation means system maintenance is easier to manageUL listed120-277 volt rating55, 60 and 75 watt rating